package com.itheima.mapper;

import com.itheima.pojo.Emp;
import org.apache.ibatis.annotations.*;

import java.time.LocalDate;
import java.util.List;

@Mapper
public interface UserMapper {
    //根据id删除数据
    @Delete("delete from emp where id = #{id}")
    public int delete(Integer id);

    //新增员工
    @Options(keyProperty = "id",useGeneratedKeys = true) //会自动将生成的主键值，赋值给emp对象的id属性
    @Insert("insert into emp(username,name,gender,image,job,entrydate,dept_id,create_time,update_time)" +
            "values(#{username},#{name},#{gender},#{image},#{job},#{entrydate},#{deptId},#{createTime},#{updateTime})")
    public void insert(Emp emp);

    //更新员工
    @Update("update emp set username = #{username}, name = #{name}, gender = #{gender}, image = #{image}," +
            "job = #{job}, entrydate = #{entrydate}, dept_id = #{deptId},update_time = #{updateTime} where id = #{id}")
    public void update(Emp emp);

/*
    //根据id查询员工
    @Select("select * from emp where id = #{id}")
    public Emp getById(Integer id);
*/

/*    //方案1：给字段起别名，让别名与实体类属性一致
    @Select("select id,username,password,name,gender,image,job,entrydate," +
            "dept_id deptId,create_time createTime,update_time updateTime from emp where id = #{id}")
    public Emp getById(Integer id);*/

 /*   //方案2：通过@Results，@Result注解手动映射封装
    @Results({
        @Result(column = "dept_id",property = "deptId"),
        @Result(column = "create_time",property = "createTime"),
        @Result(column = "update_time",property = "updateTime")
    })

    @Select("select * from emp where id = #{id}")
    public Emp getById(Integer id);*/

    //方案3：开启mybatis的驼峰命名自动映射开关

    //条件查询员工
    /*@Select("select * from emp where name like '%${name}%' and gender = #{gender} and "+
            "entrydate between #{begin} and #{end} order by update_time desc")
    public List<Emp> list(String name, Short gender, LocalDate begin, LocalDate end);*/

    //concat字符串拼接函数
/*    @Select("select * from emp where name like concat ('%',#{name},'%') and gender = #{gender} and "+
            "entrydate between #{begin} and #{end} order by update_time desc")*/

    public List<Emp> list(String name, Short gender, LocalDate begin, LocalDate end);


}
